Phase One Motor Cable for Phase One P+ and IQ Backs for Contax
Phase One Sync Signal Cleaner Cable for IQ Digital Backs (e.g. for E-shutter, tech. term = Schmitt cable). With IQ or Credo backs, you may need to use the Sync Signal cleaner cable (Schmitt cable) when using a Sinar eShutter or Rodenstock eShutter.